Shpak T. Development of an initial material for rice breeding for early maturity and productivity under Ukrainian environment

Object: the hybrid material, lines, varieties of rice with different duration of vegetation period. Aim: to improvement the methods of made out maternal material for rice breeding on early maturity and productivity. Methods: field, laboratory, biometric, metrical-weight, statistic. Novelty: to studying of efficient of individual selection on economic value properties and made out constant lines, which characterized early maturity and productivity. Results: within the National collection of rice genetic sources of early maturity with higher indices of productivity, grain quality and resistance to diseases have been identified. Selection within heterogeneous hybrid populations and evaluation of a constant breeding material of rice for the duration of vegetation period is reasonable to carry out using the value of the «panicle submersion and ejection» period duration. With a view to obtaining high variability in the duration of vegetation period, developing early maturing rice varieties which combine in one genotype complex of economically important traits and properties it is reasonable to use in hybridization as one of the parents early maturing entries from the National collection of rice. In the course of selection within rice hybrid populations it should be taken into account the direction and strength of correlations between quantitative traits, and response of certain hybrid combinations to the conditions of cultivation. Application stage: rice varieties Prestizh and Serpnevyi use in breeding and was been wrote down to State Register of plant varieties on 2008 and 2009 years properly. Application area: SIE of NAAN, rice producing farms